procmail (with postfix) Could'nt create "/var/mail/nobody"

If your using procmail with Postfix you may get this error. You can correct it this way.

Procmail requires a legitimate user to receive mail. User “nobody” is not a legitimate user. In order to have
this work you must either run procmail as root or setuid root. To have procmail run a setuid root, chmod
4755 /usr/bin/procmail.